2 Peter 3:9
The Lord is not slack concerning his promise, as some men count slackness; but is longsuffering to us-ward, not willing that any should perish, but that all should come to repentance.
1st
Jn 12:32 Jesus said; if I be lifted up from the earth, will draw "all" men unto me.
(MY PARSING: Jesus was in fact lifted up on a cross, then from the grave & via His Holy Spirit draws "ALL" to Himself. Unfortunately not all except His offer)
Some background on OP headline question:
KJV Dictionary Definition: repentance
1) To change the mind in consequence of the inconvenience or injury done by past conduct.
2) To express sorrow for something past.
3. A change of mind, or a conversion from sin to God.
(MY PARSING: Changing from denying God's sovereignty & practicing abject self-service. To acknowledging God's sovereignty & willing submitting to it.)
Repentance in regards to salvation.
Ultimately, there is only one sin that stands between one receiving God's GIFT of eternal life (Rom 6:23) & eternal separation (2 Thes 1:9) from their Creator God.
Acts 20:21 (B & C) Testifying both to the Jews, and also to the Greeks, repentance toward God, and faith toward our Lord Jesus Christ.
(MY PARSING: The key to this verse is found in the article "TOWARD". Repentance TOWARD God & faith TOWARD Christ)
When this change/repentance from unbelief to belief is mixed with FAITH placed in Christ's sin atoning death (sins required 'Rom 6:23'wage PAID), burial (proof Jesus died) & resurrection (Father's receipt, sins payment received & accepted). The end result of will be a CHANGE in/of one's actions. Find more context: 1 Cor 15:1-4, Rom 10:8-13 & Ephesians 1:13.
Rom 11:29 For the gifts and calling of God are without repentance.
GRACE - Is a GIFT given freely & received thru FAITH: Rom 3:24, 4:16, 5:1-2, 15, "11:6" "Eph 2:5 & 8"
Titus 2:11 For the grace of God that bringeth salvation hath appeared to all men,
(MY PARSING: God's Grace has a name. It's Jesus the Christ)